Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd0127887ca8d36…

MALICIOUS

PDF

41.4 KB Created: 2020-09-02 14:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 194f293177d59e2286978e12dddae1c2 SHA-1: 770d4989c5bf594323184446a67b500dd4c54ae5 SHA-256: dcd0127887ca8d365e0aede0744cdb7096beeeb15184861206e5bae29b2fe3c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Basix compliance certificate template' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a dangerous URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=basix+compliance+certificate+template
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/67724164921.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2591/files/serogewapoperedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/62764381596.pdf
    • https://static.usrfiles.com/ugd/3fc21f_5896ea891fbf4faca06dea6756048328.pdf
    • https://static.usrfiles.com/ugd/d5cf39_b6594b2759264624819de65328e1ac92.pdf
    • https://static.usrfiles.com/ugd/b8c837_8346e753212544c4a081fe7a97d82b1e.pdf
    • https://static.usrfiles.com/ugd/e481ce_d7f37454aa484ce4901c06cc492277d2.pdf
    • https://static.usrfiles.com/ugd/a3b54b_c8bb28cb26db4fdf851df2e65ff10757.pdf
    • https://static.usrfiles.com/ugd/5b604d_51025c294c6349c99dd7338079a47707.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc34efc87aa42328f72b61516303866.pdf
    • https://static.usrfiles.com/ugd/b3bc21_e0d6494b55ea4ddc9dd87fa557eb9851.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/brand_positioning_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0435/1551/0938/files/sabbath_school_lesson_study_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/mon_orthographe_illustre_larousse.pdf
    • https://cdn.shopify.com/s/files/1/0462/6451/6757/files/amman_hd_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/gabutojazarawibesid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://static.usrfiles.com/ugd/b8c837_8346e7532

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631c.bin
86d174af7fc815c71d07835054bd965e14b3d356e724a714e4a5ec70e8f509f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 5276 bytes
font_01_sfnt_off000074fe.bin
40c1e87af211d03d5b9ad38a2fe79687c1c28705d6db977ee826e70014b84fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 10400 bytes

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